Inter-Connected Seatback Tethers for Rear-Impact Thoracic Protection
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Solution Overview
Problem
Current vehicle seat restraint systems do not adequately address the need for enhanced thoracic region support during rear impact events, as they primarily rely on seat cushions and seatbelts positioned behind the occupant, which may not effectively distribute and absorb the forces of rearward motion.
Innovation Solution
A vehicle seat inter-connected tether assembly comprising a first tether, a second tether, and a vertically configured third tether, fixedly coupling the first and second tethers to opposed seat frame members, providing additional support by distributing the load across the thoracic region and positioning the tethers forward of the seatbelt and tether retractors to absorb impact forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional seat cushions and seatbelts are used for rear impact protection, then the restraint system is simple, but the thoracic region protection is inadequate
Solution Approach 1:
The restraint system is segmented into multiple functional components: traditional seat cushions for base support, seatbelts for primary restraint, and additional tether assemblies specifically positioned for thoracic region protection. This segmentation allows each component to specialize in protecting specific body regions, improving overall reliability without requiring complete system redesign.
Solution Approach 2:
Tether assemblies act as intermediary elements between the seatback and the occupant's thoracic region. These tethers are integrated into the seatback foam structure and provide an additional layer of protection that mediates the force transmission during rear impact, enhancing thoracic protection while working in conjunction with existing restraint systems.
2Reliability
If tethers are positioned forward to absorb impact forces, then thoracic protection is enhanced, but the structure becomes more complex
Solution Approach 1:
The tether assemblies are merged with the seatback foam structure, integrating the protective function directly into the existing seatback rather than adding separate, standalone components. This integration reduces structural complexity while maintaining the enhanced impact force distribution capability.
Solution Approach 2:
The seatback structure serves multiple functions: it provides the normal seating support function while simultaneously housing the tether assemblies that provide enhanced thoracic protection during rear impact. This multi-functionality reduces the need for additional dedicated components, simplifying the overall structure.
Data Source
AI summary
A vehicle seat inter-connected tether assembly includes a first tether, a second tether and a vertically configured third tether positioned between the first tether and the second tether fixedly coupled to and connecting the first tether to the second tether. A connector positioned at distal ends of the first tether and the second tether is configured to couple the first tether and the second tether to opposed seat frame members of a vehicle seat frame.